The Smith & Wesson M&P features a reinforced polymer chassis, superior ergonomics, ambidextrous controls, and proven safety features. The new standard in reliability when your job is to serve and protect and your life is on the line. Chambered in .45 ACP, this striker-fired pistol provides consumers with simple operation and reliable performance. It has ambidextrous controls and comes with three interchangeable Palmswell Grip Sizes to customize the grip. It also comes with the standard stainless steel barrel and a 1/2"-28 Threaded Barrel.